Figure 13.8 shows the amount of refined biogas produced and consumed at the farm. Figure 13.9 shows the composition of gases produced at the farm and the percentage of consumption of refined biogas. The biogas plant produced an average of

185,0 Nm3 biogas per year. Of the amount of biogas produced, about 35.3 % of the gas was consumed by gas boilers within the plant.

Raw biogas to be refined made up 42.5 % of the gas produced, and unused biogas (biogas that was not used in any stage of the process) made up 22.2 %. The amount of refined biogas completely treated by the RCF facility was about 35,000 Nm3/yr (19.1 % of the total biogas produced). The amount of refined biogas used within the farm production system as energy substitute for LPG by kitchen gas appliances and CNG trucks was about 600 Nm3/yr (CNG trucks, 462 Nm3/yr; kitchen appliances, 150 Nm3/yr).

Fig. 13.8 Composition of refined gas produced and consumed at the farm

Fig. 13.9 Percentage and breakdown of refined gas produced and consumed in Town A

This amount made up 0.3 % of the refined gas produced in a year. The amount of refined gas transported outside the farm production system was 35,000 Nm3/yr. This made it possible to supply 219 out of 3661 residences (as of November 2008) in Town A (roughly 6 % of all households).